Hi,
I am trying to read metadata off of the COW device. I used "lvcreate -s" to
create the snapshot and "lvdisplay" indicates that it is active and
available. I am using hexdump on the newly created /dev/VolGroup00/lvol1 and
I dont see the structure mentioned in dm-exception-store.c:
37 * The first chunk of the COW device just contains the header.
38 * After this there is a chunk filled with exception metadata,
39 * followed by as many exception chunks as can fit in the
40 * metadata areas.
The first 1024 bytes are all zeros. When I skip a chunk (lvdisplay indicates
that the chunk size is 8192 bytes), I dont see the magic byte-string. Am I
understanding this wrong? I get a similar result when I use "read" followed
by an "open" on the COW device. Where is the metadata on the disk?
Any help will be highly appreciated.
Thank you,
Satish
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